As you know wi-fi is a radio signal and i'm wondering if physics can help me by determining why is my internet acting weird on me. I know about waves and nodes and antinodes and I'm wondering does wi-fi have these properties and how can i position it. In a geological perspective its distance from the router is about 15 meters and elevated by 2 meters (router=downstairs, upstairs=computer). What else can weaken the signal than its distance? p.s. I'm a techno student and everything about the computer is running good and i need some insight.